https://doi.org/10.1007/s100530050525
Energy loss of 18 keV electrons in gaseous T2 and quench condensed D2 films
1
Institute for Nuclear Research, Academy of Sciences of Russia,
60th October Anniversary Prospect 7a, 117312 Moscow, Russia
2
Institute of Physics, Joh. Gutenberg University, 55099 Mainz, Germany
3
Max-Planck-Institute for Quantum Optics, Theory Group, 85748 Garching, Germany
Received:
24
August
1999
Published online: 15 April 2000
Measurements of the energy loss of fast electrons at an energy of 18 keV
have been performed on molecules of hydrogen isotopes, gaseous 
and
frozen 
.
Whereas in the case of gaseous
the
values of total inelastic cross-section
(
cm2 for
E = 18.6 keV),
average energy loss
(
eV)
and peak position of the energy loss spectra
(
eV)
agree well with the expectations, the corresponding
values for quench condensed
differ significantly from the ones for
gaseous
. We observe a significant lower total inelastic
cross-section
(
cm2, for
E = 18.6 keV)
larger average energy loss
(
eV)
and higher peak position
(
eV). These differences
may be interpreted in terms of changes of the final state spectrum. A CI
calculation for a
cluster shows indeed a clear shift of the
excited states in agreement with the observation.
PACS: 34.80.Gs – Molecular excitation and ionization by electron impact / 78.90.+t – Other topics in optical properties, condensed matter spectroscopy and other interactions of particles and radiation with condensed matter
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000
